Response of Ecological Vegetation NDVI in Bailongjiang Basin to Climatic Changes During the Past 20 Years
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摘要: 白龙江流域的植被与近16年来气温、降水的变化存在着密切关系。其中在流域中下游区域（宕昌、舟曲、武都、文县）植被与降水呈显著正相关。不同季节气温和降水对植被的影响存在着明显差异，春季气温与植被的关系以正相关为主，其中显著正相关的像元占比为26.07%，主要位于流域中上游；夏季降水与生态植被的关系以正相关为主，其中显著正相关的像元占比为11.21%，主要位于流域中下游区域；秋季气温和降水与植被的关系类似，即在流域西部为负相关、流域东部为正相关，其中显著负相关的像元占比分别为7.13%（气温）和40.74%（降水）。生长季贯穿春季到初秋的时段，气温和降水与植被的关系呈显著正相关的像元占比分别为22.08%和28.65%。Abstract: There were closely relationship between ecological vegetation and changes in temperature and precipitation during the past sixteen years in Bailongjiang basin, whereas there was a significantly positive relationship between the vegetation index (NDVI) and the precipitation within the middle and down reach of Bailongjiang basin (Tanchang, Zhouqu, Wudu, Wenxian). There was a positive relationship between spring temperature and NDVI, with the significant pixels of the relationship between spring temperature and NDVI more than 26.07%, where is located in the upper and middle reach of Bailongjiang basin. In summer, there was a positive relationship between precipitation and NDVI, with a significant pixels more than 11.21%, where is located in the middle and lower reaches of Bailongjiang basin. In the autumn, there were a negative relationship between temperature and NDVI as well as precipitation and NDVI, with the significant pixels more than 7.13% (temperature) and 40.74% (precipitation) respectively. During growing season (from spring through early autumn), there were a positive relationship between temperature and NDVI as well as precipitation and NDVI, with the significant pixels more than 22.08% (temperature) and 28.65% (precipitation) respectively.
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Key words:
- NDVI vegetation /
- Climatic change /
- response /
- Bailongjiang basin
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图 1 白龙江流域主要气象站点空间分布
Figure 1. Spatial distribution of main meteorological stations in Bailongjiang basin
图 2 2000—2015年白龙江流域NDVI年际变化
Figure 2. Interannual variations of NDVI in Bailongjiang basin from 2000 to 2015
图 4 2000—2015年白龙江流域NDVI空间分布
Figure 4. Spatial pattern of annual NDVI (2000-2015) in Bailongjiang basin
图 5 白龙江流域各密度植被覆盖像元
Figure 5. Vegetation coverage pixels of various densities in Bailongjiang basin (%)
图 6 2000—2015年白龙江流域不同季节NDVI均值空间分布
Figure 6. Spatial pattern of annual mean NDVI in different seasons from 2000 to 2015 in Bailongjiang basin
图 7 白龙江流域各季节不同密度植被覆盖像元
Figure 7. Vegetation coverage pixels against different densities in Bailongjiang basin in different seasons
图 8 白龙江流域植被覆盖年均变化趋势空间分布
（注：图(a)中P<0.05；图(b)中P<0.01）
Figure 8. Spatial pattern of annually trends of NDVI in Bailongjiang basin
图 9 白龙江流域不同季节植被覆盖年际变化趋势空间分布
Figure 9. Spatial pattern of annually trends of seasonal NDVI in Bailongjiang basin
图 10 白龙江流域植被NDVI与气温、降水相关关系空间分布
注：(a)为NDVI与气温的相关关系；(b)为NDVI与降水的相关关系；P<0.05
Figure 10. Spatial pattern of correlation between annual mean NDVI and air temperature (a) as well as precipitation (b) in Bailongjiang basin (P<0.05)
表 1 白龙江流域不同季节NDVI变化类型统计
Table 1. Statistics of NDVI change types in Bailongjiang basin in different seasons
变化类型 春季（%） 夏季（%） 秋季（%） 生长季（%） 减少（P<0.05） 24.85 46.69 62.17 46.89 增加（P<0.05） 75.15 53.31 37.83 53.11 减少（P<0.01） 43.21 63.00 71.90 58.91 增加（P<0.01） 56.79 37.00 28.10 41.09 
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表 3 白龙江流域不同季节植被NDVI与气温相关关系类型统计
Table 3. Correlations between NDVI and air temperature in different seasons in Bailongjiang basin
变化类型 春季（%） 夏季（%） 秋季（%） 生长季（%） 显著负相关 0.02 8.05 7.13 0.46 不显著负相关 3.03 39.86 45.72 31.54 不显著正相关 70.88 48.98 42.68 45.92 显著正相关 26.07 3.11 4.47 22.08 （注：显著正、负相关指达到P<0.05的显著性水平）
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表 2 白龙江流域年际NDVI与气温、降水相关关系类型统计
Table 2. Correlations between annual mean NDVI and air temperature and precipitation in Bailongjiang basin
变化类型 气温（%） 降水（%） 显著负相关 0.07 0.04 不显著负相关 20.00 13.67 不显著正相关 53.92 58.46 显著正相关 26.01 27.83 （注：显著正、负相关指达到P<0.05的显著性水平）
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表 4 白龙江流域不同季节植被NDVI与降水相关关系类型统计
Table 4. Correlations between NDVI and precipitation in different seasons in Bailongjiang basin
变化类型 春季（%） 夏季（%） 秋季（%） 生长季（%） 显著负相关 0.03 0.10 40.74 0.07 不显著负相关 2.78 22.33 28.21 10.73 不显著正相关 54.59 66.36 28.11 60.55 显著正相关 42.60 11.21 2.94 28.65 （注：显著正、负相关指达到P<0.05的显著性水平）
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